Desire Lighting Blog

How is the LED current thermal design in the most central issue, let’s take a look at the heat led lighting design issues should be how to analyze and control.

1, LED lighting design thermal analysis

Twenty-five watts of LED lighting system design is generally used for lamps, spotlights the living room, family dining lamp, night light, etc., even so, most less than twenty-five watt low-power LED lighting applications will be required to a certain degree of miniaturization. This often leads to a higher power density, although it’s power is not great. In this case, the necessary measures must be adequate thermal management by improving the mechanical structure to provide.

In addition, high electrical efficiency also helps to reduce power consumption. And the other to work long hours to prevent overheating of the LED idea is to use dimming solution. In fact, in this power range, LED lighting will replace the halogen and compact fluorescent lamps. In addition, in order to get rid of heat problems, we must get rid of temperature-sensitive passive components.

However, most current LED driver solutions are derived from the power supply topology, and on this basis, it should take into account the limited temperature range, because the general products are usually based on commercial standards, but the lights had to be able to adapt to the harsh environment to ensure .

2, LED lighting design, thermal control scheme

In the rapid development of LED lighting design, most people will focus on highlighting (HB) LED dimming control strategy. However, HB LED lighting applications the essential requirement that we will be more attention to the thermal control. While LED manufacturers through a substantial increase in the number of lumens per watt HB LED lighting design is to reduce technical barriers, but with the light output, there is still more to be distributed out of the energy into heat. Therefore, a thermal management of the overall strategy to ensure that the heat LED can be controlled as a function of temperature. With incandescent, tungsten bulbs, high power LED does not radiate heat. In contrast, LED PN junction to the heat conduction of heat to the LED package on a small piece of metal. Since the heat generated by the LED distributed using conduction, the heat needs a longer, more expensive path to go completely into the atmosphere. Currently, HB LED general lighting business of one of the biggest obstacle is the heat. Therefore, the ability to effectively and completely solve the problem can be said that the key to winning customers.

Electronic control circuit must be able to deal with trigger point and gain setting. In fact three LED need to be able to cope with the potential heat sources: self-heating, the ambient temperature and LED electronic control. Dimming with variable resistor as a method of HB LED devices is also impractical, because the resistance of the power consumed too much and need a dedicated winding resistance. The location of the LED in the resistance is very close to the case, the resistance of the additional heat will only make the problem even more serious heat. Conduction transistor element can also be seen in its power transistors, rather than a variable resistor.

With this method, generate a few responses, and thermal control and brightness for the definition of negative or positive temperature coefficient thermistor, provides more flexibility. Use of thermal resistance of LED thermal control of the most simple implementation using a PTC element. PTC element improve the low temperature growth of nominal resistance, until the trigger point.

Since the policy of aggression on a low carbon economy in 2010, savings of energy deep into cities. Beijing to achieve by grants from energy saving light bulbs to low-cost high-quality energy saving lamps in urban areas around Beijing, the first time at home in Beijing to share, to promote the light green line. This is, Guangdong, Hubei, Fujian and other places have also been popularized in energy saving lamps and make the landscape, the house, the popularity of energy efficient lighting industry, lighting products addressed a large energy saving, healthy development. Incandescent exit strategy to achieve this rapid progress and promote LED lighting, solar lighting, green, energy-saving development.

Intelligent Lighting LED lamps on the development of energy saving guide

Guangzhou International Lighting Fair, Fair Light (Guzhen Lighting Fair) and other international exhibitions, LED lighting products have become the protagonists of the exhibition, there is no doubt that modern energy-saving LED lighting, intelligent lighting, a major force in the development,

Recently, the Guangzhou Asian Games Opening Ceremony of LED lighting technology, Asia has the incredible miracle city of flowers, regardless of the stage, electronic displays, lights aviation lights seen the scene, or LED lamp beads clothing, modern low-power, high- brightness light technology, great opportunity to create most of the Asian Games Show, Asian Games opening ceremony on a global scale, the legendary event.

The rapid expansion of the Sales Lighting monopoly market improves

Currently, the market monopoly essentially Macalline lighting, home made national chain stores of origin, and the lighting in various parts of the city, including the Han, the lighting of the city, the city lights bright lights illuminate the city of Bandung exchange and so on, while in the second-tier cities, the house brand is usually mild, such as Lai really lighting, general lighting, art, Eden beauty, quality of life, etc., but master of arts in all light, just the beginning of this year, joining China Merchants After three quarters of the current has become the largest, most professional, well known, the first three quarters of this year’s Arts and Master of lamps illuminating the country’s hundreds of stores, the chain lighting, spurred the monopoly of the brand, the development of the market in the lighting around medium and small cities.

With the rapid development of the overall extent of remediation, the adaptation of modern furniture, appliances, building materials, lighting, lighting in the home as a decoration in one of the largest, while the overall consumption level of lighting, broken broken home, transportation, trade, mainly decorative several major types of furniture in the lighting industry’s third largest after the building materials industry. The energy, health, the overall increase in the notion of intelligent lighting, catalysis, “four-dimensional lighting” the era of consumerism, product quality, service, and other problems such as increased consumption, market expansion, the main problem in the form. The analysis of experts, professionals, stores, brand take the initiative to promote market stability and healthy development and the most important trend in the industry and the rise of power.

Would like to make a led lighting products can not be the most critical parts I do not know, that is popular with light, structure, electronic, and with light, structure, electronic with jargon expressed as: optical properties, thermal properties, electrical properties. At the same time, light is particularly important to understand with light, LED lighting to do well.

Optical performance (with light): LED optical performance are mainly related to spectrum, luminosity and color and other aspects of performance requirements. According to the newly established industry standard “semiconductor light-emitting diode test”, the main light emitting peak wavelength, spectral bandwidth of radiation, the axial angle of luminous intensity, luminous flux, radiant flux, luminous efficiency, chromaticity coordinates, correlated color temperature, color purity and the main wavelength, color rendering index and other parameters. Display with the LED, the main visual visual effects, so the related color index is not required, and the lighting of the white LED, color temperature, color rendering index and the illumination is particularly important, it is the lighting, atmosphere and the effect of an important indicator of color purity and dominant wavelength is generally not required.

Currently the mainstream of the global LED industry practice is to encapsulate the LED chip light source or light source module to form after the time in the light then made with light, this light source is used in the existing traditional practices, because the traditional light source is 360 ° . If you want light guide to the application side, the current Philips best to do a traditional lamp, the light loss is 40%. Many of our domestic downstream manufacturers in the use of LED lighting are in fact the optical parameters of the optical parameters of the chip or the light source, rather than indicators of the overall lighting of the optical parameters.

Now the most advanced scientific method is to do with the chip package on the light, a light guide out of the chip to maintain maximum light output so that light loss rate of only 5% -10%. As technology continues to improve, more light loss rate will be low, light source efficiency is increasing. The same with the light fixtures need to do this with light, the relative efficiency of the lamps will be greatly improved, making it more widely used to functional lighting, forming a sizeable market channels. Therefore, a good LED suppliers, is a priority, we do not need to spend costly to study how to go with our LED light as well, do not need to spend a lot of time and experience for engineers to use simulation software, the easiest way is to suppliers for LED white light to match. You know, we as software engineers to simulate, then the action is necessary to input and output. Enter data into the pre-output is the result of simulation, then the data must be accurate requires pre-simulation in order to correct the back-end.

Thermal properties (structure): lighting the LED luminous efficiency and power delivery is the key to one of the LED industry, in the meantime, LED of the PN junction temperature and shell heat dissipation is particularly important. PN junction temperature and light the greater the difference in body temperature, then the greater the resistance, followed by light can be converted into heat energy consumed in vain, and in severe damage to the LED. A good structural engineer, not only to consider the structure and the LED lamp resistance, but also consider the reasonableness of the lamp shape, fashion, new, of course, reliability and maintainability as well as practicality, that is, to stand designers the point of view and also from the user’s point of view considering the product.

Currently on Long enterprises, such as chips can be done CREE has luminous efficiency can reach 130-150lm / W. But the LED junction temperature directly affects the level of LED light extraction efficiency, device lifetime, reliability, emission wavelength and so on. Keeping the LED junction temperature within the permissible range, high-power LED chip preparation, device packaging and device applications must focus on every aspect of the key factors, especially the LED device packaging and device design must focus on solving the core problem.

Now the mainstream of applied technology to encapsulate the substrate material is aluminum, but aluminum plate package heat and light conversion efficiency of the chip are the technical core of the bottleneck, can not effectively control the junction temperature remained steady at a high light output power and optical applications because of the chip The higher the efficiency, the required area of ​​the aluminum plate the greater, will increase the cost and application size, very inconvenient. So how to open up a new path out of this misunderstanding is the central feature of the new technology. And passive cooling in low-cost way to maintain the premise, the use of high thermal conductivity media, through the new device / lights the whole structure, reducing the thermal resistance, junction temperature lower PN junction, so that the work of PN junction within the allowable operating temperature to maintain the large number of photons output, the minimum requirements are as follows:

(1) ultra-low thermal resistance material, the overall structure of rapid cooling techniques;

(2) high thermal conductivity, UV resistant packaging;

(3) application of low environmental stress structure technology;

(4) the overall thermal resistance of

(5) LED tube light source lighting control module temperature 65 ℃ or less.

Electrical properties (electronic): If a metaphor of lighting a girl, then with just her content, structure is her looks, her heart is electronic. (Always catches the eye of those who look beautiful and stylish beauty who is also the case the product). Human heart is not no life, no electronic lighting is not a power, a good drive power can determine a product’s life. Electronic standards and parameters are often much more complex than the structure, pre-investment in energy R & D is relatively large. Current technology trends and updates are changing, one day a kind of … engineers have to spend a lot of effort to learn, absorb, break down, the application of new technologies. Electronic design of pre-planning, mid-term implementation, post-molding process to be documented throughout the formation of the design data which is the most complicated thing. For example: a power supply design, a preliminary program, product descriptions, standards based, security specifications based on power performance expectations, technical requirements, raw material evaluation, testing methods, and so must form a system file.

LED drive power supply in the area, and now as an industry leader in the Moso Power Supply’s development, full of legend. Out of the LED industry keen sense of smell, Moso Power Supply head Gu Yongde led his team began in 2006 R & D LED power. Today, Moso Power Supply leads the world’s leading technology-driven trend of intelligent LED street lamp, LED lamp manufacturer proposed to provide the most reliable and intelligent drive solutions, which in turn is leading a concept model.

The role of a powerful LED driver power supply

LED power supply LED lamps as a core component of the heart like a LED, LED drive power directly determines the LED lamps is good or bad.

First, the structural design, outdoor LED drive power must be strictly waterproof, otherwise, can not withstand harsh environment outside.

Secondly, LED drive power of lightning protection functions of vital importance. Inevitably encountered when working outside during a lightning storm, if the drive power is no mine-protected, will directly affect the LED lamp life, increase lamp maintenance costs;

Finally, in the selection of raw materials, its reliability must meet their life needs to be enough good features. The current theory of life LED chip is about 10 million hours of life components such as the industry components to match the key components of the selection must be improved DMT, DVT verification management, to ensure long life and reliability requirements, otherwise life is not enough power, lamp life could not be achieved.

Therefore, LED drive power (electronic design) reliability is the foundation to support the development of LED, LED drive power in the energy-saving, efficient, life is better than traditional lamps, the LED can really save energy, promote industrial development. LED heat (structural design), is to determine the lumen maintenance, components, equipment security. LED with light (optical design), is a symbol of industry’s technology level. Master these three big technology, LED lighting also simple.

Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!